[Beowulf] RHEL7 kernel update for L1TF vulnerability breaks RDMA
chris at csamuel.org
Mon Sep 10 01:22:13 PDT 2018
On Friday, 17 August 2018 2:47:37 PM AEST Chris Samuel wrote:
> Just a heads up that the 3.10.0-862.11.6.el7.x86_64 kernel from RHEL/CentOS
> that was released to address the most recent Intel CPU problem "L1TF" seems
> to break RDMA (found by a colleague here at Swinburne).
So this CentOS bug has a one line bug fix for this problem!
It's a corker - basically it looks like someone typo'd a ; into an if
statement, the fix is:
- if (!rdma_is_port_valid_nospec(device, &ah_attr->port_num));
+ if (!rdma_is_port_valid_nospec(device, &ah_attr->port_num))
So it always returns -EINVAL when checking the port as the if becomes a noop..
Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC
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